OMG, it worked! It was indeed a calibration issue and all I had to do was press the "OK" button after selecting the "CAL" tab beside the pressure reading. Wow.
Great trouble shoot!
> I guess, the only remaining issue now is the incorrect atmospheric pressure reading of 1000 Torrs.
This is just a calibration issue. The controller should have the calibration function.
(The other Pirani showing 850Torr was also a calibration issue although I didn't bother to correct it. I think the pirani's typically has large distribution of the calibration values and requires individual calibration)